FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/core-js/modules/esnext.symbol.is-well-known.js

@@ -0,0 +1,10 @@
+'use strict';
+var $ = require('../internals/export');
+var isWellKnownSymbol = require('../internals/symbol-is-well-known');
+
+// `Symbol.isWellKnown` method
+// obsolete version of https://tc39.es/proposal-symbol-predicates/#sec-symbol-iswellknownsymbol
+// We should patch it for newly added well-known symbols. If it's not required, this module just will not be injected
+$({ target: 'Symbol', stat: true, name: 'isWellKnownSymbol', forced: true }, {
+  isWellKnown: isWellKnownSymbol
+});